I've been using the original 4x5 day tray for a while but sometimes find that I would like to have two sheets developed rather than doing one at a time, so I resized the module and made some modifications to make it suitable for two sheets of 4x5 negative. To reach the minimum liquid requirement of Rodinal 1:50, 2.5ml should be used per 4x5 sheet. This tray holds a at least 250ml which translatet to 5ml for two sheets.